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A method for motor pre-positioning estimation

A pre-positioning and theorem technology, applied in the control of generators, motor-generator control, electronic commutation motor control, etc., can solve problems such as thrust fluctuations, speed fluctuations, and reduce system accuracy, and achieve the effect of easy algorithm

Active Publication Date: 2019-10-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of positioning force, the existence of positioning force causes thrust fluctuations, which cause speed fluctuations
Moreover, it reduces the accuracy of the system and also affects the estimated accuracy of pre-positioning

Method used

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  • A method for motor pre-positioning estimation
  • A method for motor pre-positioning estimation
  • A method for motor pre-positioning estimation

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The present invention will be further described below.

[0019] The verification of the algorithm is carried out on a cylindrical permanent magnet synchronous linear motor.

[0020] Firstly, to obtain the positioning force waveform of the motor to be tested, the electric servo cylinder can be used to drag the motor mover at a constant speed, and the positioning force is transmitted through the tension and pressure sensor. The positioning force data call can use the memory to store the positioning force value of each point, or use the function fitting to fit the positioning force function, and then calculate the corresponding positioning force in real time according to the input.

[0021] Then fix the positive direction of the force, and according to the conditions of the theorem, the physical concept of the electromagnetic force and the waveform of the positioning force, select the area where the electromagnetic force and the positioning force are both decreasing functi...

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Abstract

The invention discloses a motor pre-positioning estimation method, and belongs to the field of motor control. An iterative algorithm is put forward according to the actual situation of engineering application. According to the algorithm, the main factors influencing the positioning precision in the pre-positioning process are considered, and the iteration theorem is put forward and proved to act as the theoretical basis. According to the algorithm, electromagnetic force and disturbing force are unified under a two-phase stationary coordinate system by using the mode of offline iterative computation through coordinate transformation and force and current equivalence. Direct equation analysis is replaced by the numerical iteration mode and the convergence of iteration is also proved. Compared with the conventional pre-positioning position estimation method, the method is simple, reliable, high in precision and easy to realize and also has certain judgment and data error correction capacity and has high theoretical and application value. The algorithm is verified on a linear motor and the great effect is displayed.

Description

technical field [0001] The invention relates to an algorithm for motor pre-position estimation, which belongs to the technical field of motor control. Background technique [0002] For a motor control system, the use of speed measuring devices such as position sensors may cause a series of problems, such as increased system cost, increased volume, difficulty in installation and maintenance, susceptibility to interference, and inconvenience in harsh environments. It hinders the popularization and application of the motor. Therefore, in many cases, the motor system needs to apply position sensorless control technology to meet the performance requirements of different occasions. [0003] In a motor control system without a position sensor, it is necessary to obtain the initial position of the mover first, that is, to estimate the initial position of the mover. In some occasions with high tolerance, an initial movement of the mover is allowed, thus allowing the pre-positioning...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/32
Inventor 钱振宇黄旭珍李静
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS